Price history & market evidence
PriceCharting guide history
Dated guide estimates for this edition, separate from completed sales.
1 dated observation—one point does not establish a trend. Last recorded 2026-10-06. Source record #2404255
Price observations belong to this edition. Guide estimates, catalog references and completed sales are separate kinds of evidence.
| Grade | Amount | Evidence | Recorded |
|---|---|---|---|
| 10.0 | $523.00 | PANEL_PROFITS · grade_10_0_valueguide | 1973-09-01 |
| 4.0 | $33.00 | PANEL_PROFITS · grade_4_0_valueguide | 1973-09-01 |
| 6.0 | $45.00 | PANEL_PROFITS · grade_6_0_valueguide | 1973-09-01 |
| 8.0 | $57.22 | PANEL_PROFITS · grade_8_0_valueguide | 1973-09-01 |
| 9.2 | $102.55 | PANEL_PROFITS · grade_9_2_valueguide | 1973-09-01 |
| 9.4 | $149.95 | PANEL_PROFITS · grade_9_4_valueguide | 1973-09-01 |
| 9.6 | $443.00 | PANEL_PROFITS · grade_9_6_valueguide | 1973-09-01 |
| 9.8 | $402.49 | PANEL_PROFITS · grade_9_8_valueguide | 1973-09-01 |
| RAW | $16.59 | PANEL_PROFITS · ungraded_valueguide | 1973-09-01 |
Reading this edition’s market
Compare the same cover, printing and grade before setting a bid. A raw guide or a higher-grade price does not establish a slab’s value. Include selling fees, shipping and the depth of completed-sale evidence when assessing an exit price.
The table includes 9 guide observations and 0 catalog references. These are reference values, not guaranteed sale proceeds.
Graded population
CGC records 491 graded copies for Swamp Thing #6 (1973). Population is the number recorded by this grading source, not the total print run or all surviving copies.
A Clockwork Horror
Matt Cable learns that Interpol is pulling him off of the Holland case, but he will *not* be deterred. He is determined to destroy the Swamp Thing and avenge the deaths of Alec and Linda Holland.
The Swamp Thing, meanwhile, wanders into a small mining colony in Vermont. He is shocked to discover a woman who looks exactly like his late wife, Linda. "Linda" befriends the Swamp Thing and introduces him to her husband, Alec Holland. Now the Swamp Thing knows that he must be delirious, because ***he*** is Alec Holland. The Hollands take the Swamp Thing into town to meet Mayor Hans Klochmann. Klochmann has designed the entire town and created robot citizens patterned after faces that he had discovered in newspaper obituaries (hence the reason why two of his robots resemble Alec and Linda).
Matt hears word of a Swamp Thing sighting in Vermont, and he and Abby travel to find him.
A subversive organization known as the Conclave, who has been monitoring Cable's activities for some time now, send in a robotic task force to acquire the Swamp Thing. The robot task force openly destroys the robots of Alec and Linda and then kills Klochmann. The loyal robot citizens then turn on Klochmann's assassins and kill them all, destroying themselves in the process. In the end, only the Swamp Thing is left standing, and he leaves.
| Appearing1 = **Featured Characters:** * Swamp Thing) * Abigail Arcane) * Matthew Cable) **Supporting Characters:** * **Antagonists:** * Conclave **Other Characters:** * Hans Klochmann Dies **Locations:** * Vermont
**Items:** * **Vehicles:** *
| Notes = * This issue is reprinted in: ** Roots of the Swamp Thing Vol 1 3 ** DC Special Series Vol 1 17 ** Swamp Thing: Dark Genesis (Collected) ** Secret of the Swamp Thing (Collected) ** DC Comics Classics Library: Roots of the Swamp Thing (Collected) ** Swamp Thing: The Bronze Age Vol. 1 (Collected) | Trivia = * The story's title, "A Clockwork Horror", just *may* have been inspired by the 1962 science fiction novel *A Clockwork Orange* by Anthony Burgess. * This issue's letter column includes a letter from the noted science fiction author Harlan Ellison. | Recommended = | Links =
Creative credits
Writers: Len Wein
Interior art: Bernie Wrightson
Source records & attribution
Panel Profits keeps each source identity attached to its edition record.
GCD: 26617
PANEL PROFITS: 2404255